PlantSystematics.org is one of the websites that are part of the core DOL implementation. DOL (DiversityofLife.org) is a web interface based on the Encino Software Project. It encompasses a set of server-side programs written in C and Perl combined with a comprehensive relational database with a comprehensive set of SQL query tools and user-management functions. The goal of DOL is to provide a "plug-and-play" management and server solution for biodiversity data, with tools for image database management and retrieval, morphological data management, diagnostic key generation, cladogram display and navigation, specimen data, descriptions, classifications and nomenclature. All images contributed to DOL websites (including www.plantsystematics.org) must be free of copyright restrictions, and/or the copyright held by the contributor. All images on the DOL websites can be used by the public for teaching or other non-profit projects and presentations that do not involve publication without further permission. [Information of the supplier, modified]